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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net loss $ (62,638) $ (10,657)
Adjustments to reconcile loss to net cash used in operating activities:    
Depreciation and amortization 85 107
Excess tax provision on (benefit from) stock-based awards 641 (1)
Amortization of debt discount and debt issuance costs 3,688 2,267
Amortization of intangible asset 323 323
Loss (gain) on changes in fair value of derivative liabilities 136 (7,404)
Gain on extinguishment of debt   (38,034)
Deferred income taxes (731) 7
Changes in assets and liabilities:    
Restricted cash   400
Accounts receivable (2,101) (2,719)
Inventories (6,766) 9,548
Prepaid and other current assets 1,325 (1,312)
Other non-current assets 318 1,722
Accrued interest payable 11 1,696
Deferred revenue 14,625 (1,703)
Accounts payable and other current liabilities 6,976 2,779
Other non-current liabilities 240  
Net cash used in operating activities (37,619) (38,807)
CASH FLOWS FROM INVESTING ACTIVITIES:    
Net cash used in investing activities 0 0
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from issuance of preferred stock, net of transaction costs 52,149  
Proceeds from exercise of stock options, net of transaction costs 31 284
Proceeds from exercise of warrants, net of transaction costs 2,713  
Debt issuance costs   (2,425)
Excess tax (provision on) benefit from stock-based awards (641) 1
Acquisition of treasury stock (117)  
Payments under capital leases (5) (39)
Net cash provided by (used in) financing activities 54,130 (2,179)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 16,511 (40,986)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD 119,539 191,514
CASH AND CASH EQUIVALENTS, END OF PERIOD 136,050 150,528
Cash paid during the year for:    
Interest 5,829 4,732
Income taxes 171 414
Non-cash transactions:    
Transfer of preferred stock purchase option derivative liability to equity 868  
Conversion of Series A Convertible Preferred Stock into common stock 4,804  
Accretion of preferred stock beneficial conversion feature 31,341  
Reacquisition of conversion option in convertible notes   10,100
Warrant    
Adjustments to reconcile loss to net cash used in operating activities:    
Stock-based compensation (9) (177)
Options and Restricted Stock Units    
Adjustments to reconcile loss to net cash used in operating activities:    
Stock-based compensation $ 6,258 $ 4,351